Add clean function for variant weight to be zero when form blank

dashboard/forms.py

@@ -37,6 +37,13 @@ class ProductVariantUpdateForm(forms.ModelForm):
                 product=self.instance.product
             )
 
+    def clean_weight(self):
+        data = self.cleaned_data['weight']
+        if not data:
+            data = 0
+
+        return data
+
 
 class CouponForm(forms.ModelForm):
     class Meta: